Softstarter Uwe=3x400V AC, Iwy=90A, Pmax=45kW SF-450

Softstart – smooth start and motor protection

This device is designed for the controlled start of three-phase motors, eliminating the need for star-delta starters. Using a softstarter significantly reduces inrush current when starting loaded drives, such as mills or crushers, protecting both the motor and the power supply network. This ensures a safe and efficient start-up.

Functionality and application

The SF-450 softstarter offers full control over a three-phase motor, providing six different starting characteristics tailored to the specifics of the load. The device monitors and controls torque, current and power – both during the start-up phase and during normal operation. Built-in protections protect the motor against overload, underload, overvoltage and voltage drops. This is a comprehensive solution for installers and users looking for reliable motor control.

Key features and benefits

• Smooth start: Eliminates inrush currents, reducing the load on the power supply network and extending the motor's life.
• Versatile control: Six programmable starting characteristics allow for optimal adaptation to different types of loads.
• Comprehensive protection: Protection against overload, underload, overvoltage and voltage drops ensures safe motor operation.
• Parameter monitoring: Control of torque, current and power enables precise drive management.
• Control panel: Equipped with a keyboard and LED display for easy configuration and parameter monitoring.
• Relay outputs: Programmable relay outputs allow integration with automation systems.
• Fault memory: Fault logging facilitates troubleshooting and quick repair.
• Automatic restart: Automatic motor restart function increases system reliability.

The device operates at a rated voltage of 400 V AC and is designed to work with motors up to 45 kW with a rated current of 90 A. The rated ambient temperature is 40°C. The lack of a built-in contactor (bypass) means that it must be used in some applications requiring continuous motor operation after start-up. Control is via an AC signal in the range of 0-400V.